
package org.apache.osgimaker.analyse.algorithm.dependency;

import java.util.ArrayList;
import java.util.List;

import org.apache.osgimaker.analyse.algorithm.graph.AtomicVertex;
import org.apache.osgimaker.analyse.algorithm.graph.NameAttributes;
import org.apache.osgimaker.analyse.algorithm.graph.StrongComponent;
import org.apache.osgimaker.analyse.algorithm.renderer.AbstractStrongComponentRenderer;


/**
 * Result of a cyclic check.
 */
public class CyclesResult implements Result
{
  private final List<StrongComponent> _cycles = new ArrayList<StrongComponent>();
  private final String _statement;
  private final boolean _packageCycle;

  /**
   * Creates an instance for the specified statement.
   * 
   * @param packageCycle If <code>true/false</code> the check is on package/class cycles
   */
  public CyclesResult(String statement, boolean packageCycle)
  {
    _statement = statement;
    _packageCycle = packageCycle;
  }

  /**
   * Adds the specified cycle.
   */
  public void addCycle(StrongComponent cycle)
  {
    _cycles.add(cycle);
  }

  /**
   * Returns all added cycles.
   */
  public List<StrongComponent> getCycles()
  {
    return _cycles;
  }

  /**
   * Returns the statement.
   */
  public String getStatement()
  {
    return _statement;
  }

  /**
   * Returns <code>true/false</code> if this result is on package/class cycles.
   */
  public boolean isPackageCycle()
  {
    return _packageCycle;
  }

  /**
   * Returns <code>true</code> if no cycles have been added.
   */
  public boolean isOk()
  {
    return _cycles.size() == 0;
  }

  /**
   * Returns the result in a human-readable form which is used by the {@link DefaultResultRenderer}.
   */
  public String toString()
  {
    StringBuffer buffer = new StringBuffer(_statement);
    if (isOk())
    {
      buffer.append("\tOK");
    } else
    {
      for (StrongComponent component : _cycles)
      {
        int numberOfVertices = component.getNumberOfVertices();
        buffer.append("\n  ");
        buffer.append(AbstractStrongComponentRenderer.createName(component));
        buffer.append(" contains ").append(numberOfVertices);
        buffer.append(' ').append(_packageCycle ? "packages" : "classes").append(':');
        for (int i = 0; i < numberOfVertices; i++)
        {
          buffer.append("\n    ");
          AtomicVertex vertex = component.getVertex(i);
          buffer.append(((NameAttributes) vertex.getAttributes()).getName());
        }
      }
    }
    return new String(buffer.append('\n'));
  }

}
